in

in case of的of是介词，介词后面只能带名词性质的词，比如名词、代词等，用来描述“如果/当事情发生时我们该做些什么”。in case是连词，引导条件状语从句，也就是说in case后面是一个完整的句子，用来描述“我们要预先做好某些准备，以防万一”。

in case of的例句

It would be safer to take more money with you in case of emergency.

多带点钱保险些，以防急用。

The insurance plan will provide substantial cash benefits to your family in case of your death.

投保人一旦死亡，该项保险将给其家属支付相当可观的保险金。

She had had the foresight to prepare herself financially in case of an accident.

她有先见之明，经济上作了准备以防万一发生事故。

in case的例句

In case you should need any help, here's my number.

万一你需要帮助的话，这是我的电话号码。

I have also taken out a life insurance policy on him just in case.

为防万一，我还给他买了一份人寿保险。

I'll stay around in case you need me.

我就待在这儿，也许你用得着我。